Stockpickr: Seeking Buffett's Apprentice

Additionally, at just 8 times cash flow, the stock is cheap. "Our low-side estimate is 50% to 75% higher, and our upside estimate is a double, or even a triple from here."

A lot of quality investors own Tyco stock. For instance, Bill Miller is a big fan of Tyco. Doug Kass' old boss, Leon Cooperman, owns it, and finally, Buffett himself owns the stock.

Spencer Capital's largest position is Crosstex Energy(XTXI Quote). Shubin Stein said that "the gas pipeline business is almost like a monopoly. You get very long-term contracts with customers, and you pretty much know in advance the volume of gas going through the pipelines each year and the prices, etc."

Crosstex distributes gas produced in the Barnett Shales through its pipelines. It has long-term contracts with Devon Energy(DVN Quote). "What's interesting is that recently, other fund managers have been accumulating large positions in Crosstex," Shubin Stein told me.

Another fund that owns Crosstex is Chieftan Capital, run by Glenn Greenberg. Bruce Greenwald, who wrote the book, Value Investing: From Graham and to Buffett and Beyond, recently said of him:

There's a guy called Glenn Greenberg who absolutely says he's not a value investor and is just about the best value investor out there. ... So Glenn does seven to 10 companies, but he really understands the economics. He's just a brilliant, sort of natural industry economist. And he's just naturally good at judging these franchises, almost unconsciously so. And I think that's the thing I would find most impressive ... I think Glenn Greenberg has it.

Go to Glenn's Greenberg's portfolio page on Stockpickr to check out his holdings.

Another holder of Crosstex is Whitney Tilson, through his Tilson Focus Fund.

Tomorrow I'll continue the survey of whom I consider potential heirs to the Buffett throne. For more on Shubin Stein and his fund, check out the Spencer Capital portfolio page on Stockpickr.